Python 點滴積累（4）

for迴圈

>>> colors=["red","blue","white","green"]

>>> for color in colors:
... print(color)
...red
blue
white
green

>>> for value in range(1,6):

... print(value)
...123
45

>>> numbers=list(range(1,5))

>>> print(numbers)
[1, 2, 3, 4]

>>> even_numbers=list(range(2,11,2))

>>> print(even_numbers)
[2, 4, 6, 8, 10]

>>> colors=["red","orange","yellow","green","blue"]

>>> print(colors)
['red', 'orange', 'yellow', 'green', 'blue']
>>> colors[1:4]
['orange', 'yellow', 'green']
>>> colors[:3]
['red', 'orange', 'yellow']
>>> colors[2:]
['yellow', 'green', 'blue']
>>> colors[-2:]
['green', 'blue']

>>> for color in colors[1:4]:

... print(color)
...orange
yellow
green

>>> color=["red","orange","yellow","green","blue"]

>>> another_color=color[:]
>>> print(color)
['red', 'orange', 'yellow', 'green', 'blue']
>>> print(another_color)
['red', 'orange', 'yellow', 'green', 'blue']
>>> print(color)
['red', 'orange', 'yellow', 'green', 'blue', 'white']
>>> print(another_color)
['red', 'orange', 'yellow', 'green', 'blue']

元組使用圓括號來標識

訪問元組和訪問列表語法相同

>>> animals=("pig","dog","cat","sheep")

>>> animals[1]
'dog'
>>> animals[-1]
'sheep'
>>> for animal in animals:
... print(animal)
...pig
dogcat
sheep

>>> animals=("pig","dog")

>>> animals[0]="lion"
traceback (most recent call last):
file "", line 1, in typeerror: 'tuple' object does not support item assignment
>>> print(animals)
('pig', 'dog')
>>> animals=("lion","monkey")
>>> print(animals)
('lion', 'monkey')

Python 點滴積累（2）

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